Z-contrast imaging of the arrangement of Cu in precipitates in 6XXX-series aluminium alloys

Phase Identification of Nanometric Precipitates in Al-Si-Cu Aluminum Alloy by Hr-Stem Investigations

“…because of interpretable nature of the HAADF images, Q precipitate may easily be distinguished. Our conclusions are consistent with the result of previous investigations of small precipitates in the Al matrix of 6XXX-series aluminum alloys [15]. (Fig.…”

Grain boundary precipitation induced by grain crystallographic misorientations in an extruded Al–Mg–Si–Cu alloy

“…Addition of copper into Al-Mg-Si wrought alloys is an effective approach to improve their mechanical properties through the precipitation of Q 0 phase [4,5]. Unfortunately, copper is found to increase the susceptibility to intergranular corrosion of aluminium alloys [6], which is significantly associated with the microstructure [7].…”

Studies of Orientations of β″ Precipitates in Al-Mg-Si-(Cu) Alloys by Electron Diffraction and Transition Matrix Analysis

“…[7][8][9] Some articles have also claimed the formation of other metastable precipitates during isothermal heat treatment by adding the excess Si or a small amount of Cu to alloys. [10][11][12][13] The precipitation sequence can further be described as follows: SSSS fi cluster/GP zones fi metastable b¢¢ fi metastable b¢ + U1 + U2 + B¢/Q¢ fi stable b + Q, where the clusters and GP zones are spherical, which can become the nucleation sites of the b¢¢ phases with needle-shaped morphology in subsequent artificial aging. [9] Further, the phases U1, U2, and B¢, formed after b¢¢ phase in the aging sequence, can also be known as type A, type B, and type C, respectively, [11] generally co-evolving with b¢ phase.…”